本刊1980年第五期刊登了《八字形零件的不同轴度误差》一文(以下简称原文)。原文重点讨论了π形精密零件(见原文图1)双臂上小孔D≤3～4毫米、跨距L》D情况下的同轴度误差。笔者在测试方法上提出一点粗浅的看法。原文对π形精密零件作这样的假设:两孔轴心线在同一平面内且可相交,成为一个八字形,并具有对称等高性。利用这种性质,在原 The fifth issue of 1980 issue of “eight-shaped parts of different axial error” article (hereinafter referred to as the original). The original article focused on the π-shaped precision parts (see original image 1) on the arms of the hole D ≤ 3 ~ 4 mm, span L "D case of coaxial error. The author put forward a little superficial opinion on the test method. The original π-shaped precision parts made the assumption that the axis of the two holes in the same plane and can intersect to become a figure eight, and has symmetrical contour. Use this nature in the original